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Detection rules › Kusto

TI Map URL Entity to OfficeActivity Data [Deprecated]

Severity
medium
Time window
14d
Source
github.com/Azure/Azure-Sentinel

'This query is Deprecated as its filter conditions will never yield results. This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in OfficeActivity data.'

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1071 Application Layer Protocol

Rule body kusto

id: 36a9c9e5-3dc1-4ed9-afaa-1d13617bfc2b
name: TI Map URL Entity to OfficeActivity Data [Deprecated]
description: |
  'This query is Deprecated as its filter conditions will never yield results. This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in OfficeActivity data.'
severity: Medium
requiredDataConnectors:
  - connectorId: Office365
    dataTypes:
     - OfficeActivity
  - connectorId: ThreatIntelligence
    dataTypes:
     - ThreatIntelligenceIndicator
  - connectorId: MicrosoftDefenderThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceTaxii
    dataTypes:
      - ThreatIntelligenceIndicator
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
query: |
  let dt_lookBack = 1h;
  // let ioc_lookBack = 14d;
  // ThreatIntelligenceIndicator
  // // Picking up only IOC's that contain the entities we want
  // | where isnotempty(Url)
  // | where TimeGenerated >= ago(ioc_lookBack)
  // | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  // | where Active == true and ExpirationDateTime > now()
  // // using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
  // | join kind=innerunique (
  // OfficeActivity
  // | where TimeGenerated >= ago(dt_lookBack)
  // //Extract the Url from a number of potential fields
  // | extend Url = iif(OfficeWorkload == "AzureActiveDirectory",extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)", 1,ModifiedProperties),tostring(parse_json(ModifiedProperties)[12].NewValue))
  // | where isnotempty(Url)
  // // Ensure we get a clean URL
  // | extend Url = tostring(split(Url, ';')[0])
  // | extend OfficeActivity_TimeGenerated = TimeGenerated
  // // Project a single user identity that we can use for entity mapping
  // | extend User = iif(isnotempty(UserId), UserId, iif(isnotempty(Actor), tostring(parse_json(Actor)[0].ID), tostring(parse_json(Parameters)[0].Value)))
  // ) on Url
  // | where OfficeActivity_TimeGenerated < ExpirationDateTime
  // | summarize OfficeActivity_TimeGenerated = arg_max(OfficeActivity_TimeGenerated, *) by IndicatorId, Url
  // | project OfficeActivity_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Operation,
  // UserType, OfficeWorkload, Parameters, Url, User
  // | extend timestamp = OfficeActivity_TimeGenerated, Name = tostring(split(User, '@', 0)[0]), UPNSuffix = tostring(split(User, '@', 1)[0])
  datatable() []
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: User
      - identifier: Name
        columnName: Name
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: Url
version: 1.2.9
kind: Scheduled

Stages and Predicates

Parameters

let dt_lookBack = 1h;

Stage 1: source

datatable() []